You are viewing the version of this documentation from Perl 5.22.4. View the latest version
length EXPR
length

Returns the length in characters of the value of EXPR. If EXPR is omitted, returns the length of $_. If EXPR is undefined, returns undef.

This function cannot be used on an entire array or hash to find out how many elements these have. For that, use scalar @array and scalar keys %hash, respectively.

Like all Perl character operations, length() normally deals in logical characters, not physical bytes. For how many bytes a string encoded as UTF-8 would take up, use length(Encode::encode_utf8(EXPR)) (you'll have to use Encode first). See Encode and perlunicode.